Concrete-construction apparatus.



' G. S. MUMFORD.

CONCRETE CONSTRUCTION A TUS.

APPLICATIOlf FILED APR. 6.

Patented June 15, 1915.

ennnon s. nunronn, or new rennin. Y.

CQNCBETE-CONSTRUCTION APPARATUS.

Speciflcation of Letters Patent.

Patented June 15, 1915.

Application filed April 6, 1915. Serial No. 19,611.

To all whom it may concern Be it known that I, GURDON S. MUMFORD, a citizen of the United. States of America,

i residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Concrete-Construction Apparatus, of which the following is a specification.

This invention relates to concrete construction apparatus, and in its more intense aspect to securing or supporting means adapted to be positioned within a concrete structure or surface either-before or after the erection of said structure.

One of the objects of the present invention is to provide a simple, practical and inexpensive means or member of the above character adapted to' perform numerous functions according to the use to'Which it is put.

Another object is to provide a device .of the above general character which may be easily applied to a finished concrete surface to act as a firm anchoring socket for the re ception of coacting supporting members.

A further object is to provide a device of the first above-mentioned character capable of use as a tie member for holding two or more mold members together during the process of casting a concrete structure.

A further object is to provide a device of the above mentioned character adapted to receive a supporting device and provided with effective anchoring'means adapted to prevent a removal of the supporting device under the mostscvere strains yet permitting intentional removal thereof when desired with a minimum effort.

Other objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention.

This invention accordingly consists in the features of construction, combination of parts and in the unique relations of the members and in the relative proportioning and disposition thereof, all as more completely outlined herein.

To enable others skilled in the art so fully to comprehend, the underlyin thereof that they may embody tie same by the numerous modifications in structure and relation contemplated by this. invention,

features drawings depicting a preferred form have been annexed as a part of this disclosure,

and in such drawings, like characters of reference denote corresponding parts throughout all the views, in which:

Figure 1 is a sectional elevational view of the complete apparatus in position within a finished concrete surface showing one appli- 6 3131011 of the invention; Fig. 2 is a perspective View of certain parts of the apparatus shown disassembled; Fig. 3 is an end view of the socket part of the apparatus; and Fig. 4 is an end view of the socket part and shield of a modified form.

The invention Will be hereinafter described with relation to its application as a socket member for the reception of a coactingly threaded supporting or fastening member, such as bracket bolts on a side wall, eye-bolts, shaft hangers, or attaching members in general.

In a concrete apparatus of this character in which a spirally wound member is adapted to receive a threaded member when embedded in a finished concrete wall the objection may have arisen that the device had insufiicient anchorage surface of a depth and length for efficiently performing the desired results. For instance, in an ordinary spiral or helical coil embedded in concrete for the reception of an eye bolt or hook there would be insufficient area about the helical socket to eliminate the possibility of a crumbling of the concrete about the socket thus causing a loosening of the member entirely. While it may have been attempted to overcome this objection by providing radial projections from the body of the socket relatively close to the concrete surface it has never been successfully done so'far as applicant is aware, for in cases of severe strains, the points of anchorage have been soclose to the surface of the wall as to cause a loosening and falling out of the socket.

Referring now to the accompanying draw ing in detail, and more particularly to Fig. 1, 5 denotes a finished concrete structure into which a hole or recess, indicated by the lines 6, is tapped having a tapering, frustro-conical or wedge shape. This hole is then partially filled with a relatively soft pasty concrete mixture or grouting, and the anchor socket pressed firmly therein to the desired depth. During the setting of the soft grout: ing 7 the anchorage device is provided with a threaded member or bolt 8 passing through a mold board 9, or the member to be secured by the bolt if desired, thereby to prevent the concrete from filling the interior of the an chor socket and squeezing out through thefront of the opening before the concrete"? has solidified. This socket member is preferably formed from a single integral piece of wire of any desired diameter, according to the use and strain to which it is to be out and the size of the member to be supported thereby. This member itself may for I right-hand threaded bolts when inserted in either end should it be used as a tie for two mold members, or the like. The socket member is also preferably longer than the anchor member, although it could be of the same length and size. These coils l1 and 12 will be considered as having free or adjacent ends and as being secured at their'outer ends to the body portion. A straight groove may be cut through coils 11 and 12 as shown in Fig. 3 to permit of body portion 10 fitting.

snugly in the groove for purposes more specifically hereinafter stated.

it is preferred to make the hole or recess 6 substantially of the shape above stated for the reason that the socket, besides having the usual firictional adhesion between the cement and the walls of the opening, will also be provided with a correspondingly shaped block of solidified grouting adapted to prevent the socket being drawn out through the smaller entrance to the hole. By constructthe device and hole in this way a tension pull on the supported member will also put the socket and anchornndcr compression so far as the coils are concerned, and if the hole is slightly enlarged inwardly the concrete wedge front or the anchor member also placed under compression which develops greatest eiliciency.

Most anchorage devices of this characterare inserted in a finished wall substantially as above stated, although it is, of course, to be understood that the anchor socket could be put in place during the casting of the wall. There are, however, certain objections to such procedure, inasmuch as it is difficult to determine the exact position in advance, due to absence of available points for measurement. With this device, if desired, there may be used either or both auxiliary collars 13 and 14, of a size and shape adapted to fit snugly over the ends to coact in an interlocking manner with the helices and body portion as may be desired. They may be of, the same length as the socket and anchor, although it is preferable to have outside lines of the coils holds the coils of the helixin rigid position and prevents unwinding or stripping of the turns of the helix over the threaded surface of the coacting threaded member. The instant the outer wire coil starts to strip it jams itself inside of the incasing collar for it has no room to expand over the maximum diameter of the threads of the bolts and if the body portion 10 is'held' firmly in the groove 15 in the helices there is no possibility of the body portion 10 and collars 13 and 14 rotating aroundthe helices due to their interlocking engagement. Such a construction ef ectively prevents an initial longitudinal stretching of the.tie member, as might occur to a threaded tie member in which the outer coils were permitted some silght expansion or movement out of their original shape.

It is, of course, to be understood that other rigid encircling devices may be substituted for collars 13 and is: to have an incasing effect in such a manner as to confine the helices 11 and 12 and hold body member 10 rigidly in place such as shown in Fig. e where a collar 16- is slipped over the coil between the body portion and the coiland provided with a groove 17 on its outer surface and notched at its end to receive the body portion in an interlocking manner.

It is thus seen that this invention provides a simple and practical device capable of various uses and functions, and adapted to accomplish, among others, all or" the objects and advantages above set forth.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various applications without omitting certain. features that, from the standpoint oi? the priorart, "fairly constitute essential characteristics of the generic or specific of this invention, and therefore such adaptation should and are intended to be comprehended within the meaning range of equivalency of the following claims.

I claim:

1. A. device of the character described comprising an elongated body portion having anchorage means at one end, and a helical coil at the other end, said body member extending along the side of the helix and connected therewith at the outer end thereof.

2. A device of the character described.

comprising an elongated body portion, and a helix at one end thereof substantially parallel with said body portion and having an interlocking engagement throughout its length with said body portion.

3. A device of the character described comprising an elongated body portion having a helix at each end substantially coaxial with each other and connected at their outer extremities with said body portion.

4. A. device of the character described comprising an elongated body portion having a helix at each end connected at their outer extremities with said body-portion, said helices being wound in opposite'directions when viewed from one end whereby either end may receive an ordinary righthand threaded member.

5. A device of the character described comprising an elongated body portion having an anchor dev'ice and a helical coil in tegraily formed with the body portion at one end, said coil being bent back into a position substantially parallel with said body portion.

6. A device of the character described comprising an elongated body portion havhold the body portion in fixed relation thereto.

7 8. A device of the character described comprising an elongated body portion having an anchor device adapted to be inserted in an outwardly tapering recess com risirn a body portion, a helix at one end t erect, and means surrounding said helix adapted to prevent an unwinding thereof: to cause a stripping of the helix over the threads of a bolt when inserted therein.

9. A device of the character described comprising an elongated body portion having an anchoring device at one end and a socket adapted to receive a threaded bolt at the other, and a collar surrounding said socket.

10. A device of the character described sing an elongated body portion, a

helix at one end extending in the samegeneral direction as the body portion, and means holding the body portion and helix in fixed relation and adapted to prevent relative expansion of the helix wherebyit could strip over the threads of a coacting bolt when inserted in said helix.

11. A device of the character described comprising an elongated body portion, a

helix at one end extending in the same general direction as the body portion, and

means holding the body portion and helix in fixed relation and adapted to prevent relative expansion of the helix whereby it could strip over thethreads of a coacting bolt, said means including a groove in the outer surface of the helix into which the body portion rests.

12. A device of the character described comprising an elongated body portion having an anchoring device at one end, a helix at its opposite end extending in the same general direction as the body portion, means binding the body portion and helix in fixed relation and adapted to prevent relative expansion of the helix whereby it could. strip over the threads of a coacting bolt, said last mentioned means comprising a generally cylindrical sleeve surrounding a portion of the helix and adjacent body portion. 7

13. A device of the character described comprising an elongated body portion having an anchoring device adapted to be inserted in an outwardly tapering recess, a helix connected with the body portion adapted to receive a threaded member, and means adapted to prevent an expansion or said helix, said anchoring device being of a diameter substantially equal to that of the entrance to the tapering recess.

-1 A device of the character described comprising an elongated body portion havmg a helix adapted to receive a threaded member, and a collar surroundlng said helix adapted to prevent expansion thereof and 16. A device of the character described comprising an elongated body portion equal to the total length of said device, and substantiallycoaxial helices connected their outer ends with said body portion adapted to receive threaded members whereby said helices are compressed when subjected to a tensional strain.

17. A device of the character described comprising an elongated body portion substantially equal to the total length device, and helices connected at their outer ends with said body portion adapted to receive threaded members whereby said helices are compressed when subjected to a ten sional strain, and means adapted to cause a jamming of the turns of-the coils when subjected to such strain.

18. A device of the character described comprising an elongated body portion and helices connected at their outer ends with said body portion. for receiving threaded members whereby they are compressed when subjected to a tensional strain exerted in the direction of the-length of said body portion,'and means adapted to cause a jamming of the turns of the coils when subjected to such strain, said last means comprising approximately cylindrical collars closely fitiaeaeao ting over said helices and coacting with the body portion.

19. A device of the character described comprising an elongated body portion ing a helix at each end substantially coaxial with each other and connected at their outer extremities with said body portion, and

means for holding the body portion and helices in fixed relation, said means including a collar adapted to be slipped over the helix and coact on its outer surface with body portion. 

